Tool-holder.



No. 874,027. PALLNTED OLO. 17, 1907.

G. NELSON. TOOL HOLDER.

APPLICATION FILED JUNE 22.1905.

GEORGE NELSON, l"

PATE T FF l t L E.

euioAoo, ittiNois.

TOOL-HOLDER.

Specification of Letters Patent.

Patented Dee. 17, 1907.

Application filed .Tune 22. 1905. Serial No. 266.383.

To all whom 'it may concern:

Be it known that l, (lnonon NELSON, c1t1- zen of the United States, residingr et Chicago,

` e port of this epplicatien:-i"irure 1 shows rposition in the machine or altering securing e. tool in position in the holder which cured in an oblique position; Fig. 2 shows the 1n thecounty of (.ook :1nd Stute ot' illinois, have invented certain new end uselul lnirovernents in Tool-llolders, of' which the olloring is :i speeilicntion.

.My invention rela-tes to. tool holders and especially to that class ol devices adopted tor universal use in the`yarious machines de signed for metal cutting such es lathes, drill presses, vertical and horizontal boring niills.

Important objects of my invention ure to provide e device for securely end properly oldingr a larger variety of cutting,r tools of different sizes sind patterns than is possible, lith holders heretofore constructed; to enable the cutting tools to be held at various angles and to permit n tool to he changed without moving'the holder or bnr from its the relain tion of thcoutting edge to the Work.

Another object of my invention is to ztilord means vlor automatically centering tools of certain iorms.

Oney groot advantage ol iny improvement is the. securing ot a, nie-xiinuin lstrengthend rigidity with a ininiuniin weight, which is zic mrnphshed hy so relating,r the striufturnl that lthe strain of the work will he liorne hy the nniin body ot the holder instead of by the cutting port or tool, as is usually the cese.

rlinother advantage lies in the method of insures that the strain put upon the drew holt when :i Wrench is used to lock a. tool in. phioe will he horno by the strongest portion el the d1 ze. v v

.ln the ecocinpnnying drawing 'which l'orins my improved holder with :t cutting tool se* holder 'turned 90 'from its position as seen 'in Fig. '1, and with a self-centeringdouble-ond cutting tool sccigred therein; Fig. 3 is a longi tudinnl section ol Fig. 1, on the line are; litige is a View o 'l the drow-bolt with it por tionfhrolien sway to show the formation of the slot in the auxiliary head; Fig. 5 is :i fragmentary View in elevation ot the slotted end ol' my improved tool-holder with a self-ccntering douhlc-cnd cutter held therein; Fig, 6 is a detail oi e. sellcentcring douhle-end cutter, and Fig. 7 is im ond 'View of my improved wol-holder showing the relative positions oi the'end slots.

Similar characters of reference indicate correspoiuling,T pztrfts in the several ligures.

liefert-ine' more pnxtif -,illnily tothe drewings, l represents n hollow cylindrimtl steel har having :t here 2 of uniform diameter throughout its length, and furnished with. interuel threads In at its holding,lr end and o; series ol' slots 1, 4, 5, sind 6, at itsl operative end, two of seid slots 4, 4, being open und cut in opposite sides of the har so as to register euch with the other` The ends ot the slots 4, 4, are formed at right ongles to the longitudinal axis of the bnr.- The inner end of the slot 5 is cut at en oblique single with the seid irxis and it short distance from thc end is ai slot `(i which extends through one sido only ol` the bar.

At points between the'ends ol' the hair ore eut e. plurality ol` elongated slots 7 extemlingjr therethroiurh, the slots in one side oi' seid har registering with the slots in the oppositeside. These slots :rre shownoi' equul dimension, hut ,l do not wish to lie limited to the preeise 'torni 'indicated since it erident that they muy he inode ol' Various shapes und :regularity so that various cutting tools Juny he held in diiiercnt oblique positions :is well :is :Lt right angles to the longitudinal :mis of the lmr. '.lhrcughout n portion of 'its length the lmr is externnlly, threaded us :it 5% the lntr heilig formed with :i sullieiently grenter eross-dinnicter nt this point for that mrpose. A longitudinal'slot t) Lis'cut through hoth Walls of thc her, seid slot lor u portion olf' its length bein@ Within the threaded portion t) and extending,r therefrom into the untluoiided portion of the cylinder.

For use in eertciz'i elnss ot nntchii'ies i pro Vide it tapered shrink 10 externally threaded to engage the internal thread 3 in the han'. By ineens ot this shank the holder, cnn he rigidly held in the machine, and et the sanne time the. length ol the lier is materially in-A creased. Fittingr within the here ol the ller is ndratw holt l1 which is furnished near one end with e slot 12 and ut'its opposite end is reduoed in diameter vand on such reduced portion is out n. thread 13 to'receivc an nuxilinry head 'i4 in which is out n longitudinal slot l5 one end Wall of' which is cut sway to form im oblique fece lll, 'While itt its opposite end the slot hes two oblique. faces 17. ln-

terinediote the ends or" the draw holt are elonrated slots 1S one end wall of catgh slot having ohhque faces 1t). The said auxiliary head is au important feature ot' my invention since it can ho turned in either direction to 5 liring its slot 15 into alim .nent with the various'slots in the har and also permits of adjustineut for dill'erentsizes oi cutters.

A nutv 2t) travels on thc external threaded portion lh' ot' the har and has lnurled laces 21 to all'ord a, grasp t'or the lingers and holes i 22 to receive the lugs of the ordinary spanner 1.5 wrench. The threads olI the nut are cut away t'or a short distance at one end to lornr: A lie'v 2i lits closely t an annular recess fr the, slot. 12 in the draw-holt, through which it passes, projecting aty each end through the slots El in the'har suiliciently to permit eugagenient with the nut, 2t). i'aced on oneI edge near each end lo form shoulders to engage with the said recess 23 on the inside ot' the nut Ztl. rl`his method 25 of putting traetion upon the drawholt to hold the tool seourely is of ver)v great advantage. rl`he comparatively lange diameter ol' the nut and its frictional surfaces form a irm grasp for the hand and it cau he, rapidl)vr op erated so that a wrench need he used for on v )art of a turn to loosen or tighten. the screw. i

As the thread 8 is cut upon the outside of thc thickened walls ot: the. har the latter is not weakened therehy, and heing placed ucar the shanlv' this part, ot' the device is vconvenient for manipulation while the tool is in the machine and will'not interfere with the work heing perl'oriued.

in order to permit the insertion ot' a cut- 40 ting tool, the uut.- 2() is turned hacli until the key 24' is released suiiiciently to allow the draw-holt to he drawn outwardly uutil the lower end ol' the auxiliary head ol` thedrawholt protrudes when any neoded adjustment in tho length ol' they draw holtv maj" he accomplished hy turning the auxiliaryAv head on its axis or the key ma)1 he entigrclywithdrawn from its slot in order to 'facilitate the adjustinout.

the ond of the holder the, draw-holt isserewed toward such end sufficiently ta allow the tool to he plaeed in positionfin the `slots si, 4l, if it.l is to he used at right-angles to the holder or 55 irl the slots 5 and ti as shown in Fig. 1, when au ohlirpie position is required.

ln order to hohl the tool 26 firmly in place tho draw holt is so adjusted that the slot 12 will register with the slot. tl, the key .24 then inserted and the nut 20 turned until the recess 2K engages the shoulders 25 ot' the key, thus drawing upon the draw holt and preventing the ltey 24 from working loose. during the use ol the tool. For the purpose ot tightening the tool moro securely than can nother` advantage ot' this construction is the facility it, atlords to var v the length of the 10 draw holt tor anjv purpose whatever.

The key J4 is If it. is desired to use a sing-'ie cutter tool at' he done hr the hand the nut- 2() is fashioned so that some form oi wrench can he used thereon.

ln order to use a tool at a median position in the holder the l e v 24 is released or removed hv loosening the.. nut 2() and the draw-holt moved until the required tool can he inserted iu the registering slots. 'lho lief: is then replacedv it it should have heen entirelj ro y moved, aud the tool lirmly secured in posi tion hy means oll the nut '.20 iu the manner lureinlal'ore descrihcd, no adjustment of theI auxiliary head hcing required in such ease.

lt will he noticed that no rotary adjustmeut is required in order to cause the slots 7 aud lo to register when the hejV 12st is simpl)r loosened hi' retracting the, nut 20, tho longil tudinal adjust meut, which is governed hy the width of the l\'e v in relation lo the length-of j the slot t) in the c vlinder, heiug usualljV sulli i cient to accomplish the desired adjustment. l The use ol a. tool in an ohliqne positiou'at j the end has the advantage that the cutting 1 edge projects sulliciently to give an advance t cui when operating. t douhle end cutter 2G is shown iu Fig, 2 ina median position. l't is also seen in Fig. j 5 placed at the end of the c vlindcr where it engages the slots -t, -t, and held in position. hy l the auxiliary head. 'l`his tool is automatic-- all \r centered hy means of a shoulder 2T and a recess .The shoulder 2T has its edge 'l'acos 2t) formed to lit the hore ot the cylinder ed to receive. that portion of' the draw-holt adjacent to the slot in which the tool ma.)Y he inserted. TWhen this tool 26 is used at the end of thc holder il has the advantage of giving an advance cut as iu the case of the straight single cut tool t held ohlitpielvv and as the centering shoulder 2T is formed on the side opposite to the cutting edge the tool ma)v he sharjuued and in time entirely worn out without destroying its sell' centering l'caturcs` lt is ohvious that man v changes ma)v he made in the form and construe-tion ot mv device without departing from the spirity thereof, hut l Having thus described my invention, I claim as new and desire to secure hy Letters Vlatent the `following: v

.ln a tool-holder, the'` combination with S, slotted har .and a slotted drawholt tilting the internal hora thereof, of means for varyliirg the length of said .(lrawfholt, and means for adjusting said draw-holt relatively to said har, in oneI direction. Q i

In testimony whereof I aflixniysignaturo in presence of two witnesses. u

Y GEORGE NELSUN.

Witnesses:

l and the inner faces Sil() ot the recess are adaptt its 

